PSLE
Stores W and X sell post-it-pads of four colours. The bar graphs show the number of post-it-pads sold by each shop in May. The bar for the number green post-it-pads sold by Store W has not been drawn.

1. Half of the post-it-pads sold by Store W were green post-it-pads. How many green post-it-pads did Store W sell?
2. Which colour(s) of post-it-pads did Store W sell less than Store X? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In June, Store X sold 20 more yellow post-it-pads than the number of yellow post-it-pads sold in May. What was the percentage increase in the number of yellow post-it-pads sold by Store X from May to June?

(a)
Number of yellow post-it-pads sold in Store W = 70
Number of orange post-it-pads sold in Store W = 70
Number of pink post-it-pads sold in Store W = 10

Since green post-it-pads sold in Store W is half of the post-it-pads sold by Store W, the total of yellow post-it-pads, orange post-it-pads and pink post-it-pads is equal to green post-it-pads.

Number of green post-it-pads sold in Store W
= 70 + 70 + 10
= 150

(b)
Number of yellow post-it-pads sold in Store W = 70 (More)
Number of yellow post-it-pads sold in Store X = 50

Number of orange post-it-pads sold in Store W = 70 (Equal)
Number of orange post-it-pads sold in Store X = 70

Number of pink post-it-pads sold in Store W = 10 (Less) 
Number of pink post-it-pads sold in Store X = 70

Number of green post-it-pads sold in Store W = 150 (More) 
Number of green post-it-pads sold in Store X = 50 

Colour(s) of post-it-pads that Store W sold less than Store X = Pink (P)

(c)
Percentage increase in the number of yellow post-it-pads sold by Store X from May to June
= ²⁰₅₀ x 100%
= ²₅ x 100%
= 40%

Answer(s): (a) 150; (b) P; (c) 40%